Sealing device



2 Sheets-Sheet 1 ATTO I C. H. HOWARYJ ssanma mwxca Filed Oct. 26. 1925Dec. 13, 1927.

Dec, 13, 1927.

c. H. HOWARD SEALING- DEVICE Filed Oct. as. 1925 2 Sheets-Sheet 2 4 y ay v g// /////A J! A TTORN Patented D... 13,1921.

UNITED STATES PATENT OFFICE."

CHARLES H. HOWARD, OF SAUGUS, MASSACHUSETTS, ASSIGNOB, BY MESNE ASSIGN-MENTS, T0 AMERICAN BE-ENFORCED PAPER COMPANY, 01 ATTLEBORO, MASSA-CHUSETTS, A CORPORATION OF MASSACHUSETTS.

SEALING DEVICE.

Application filed October 26, 1925. serial No. 84,779

This invention relates to devices for sealing or securing together theoverlapping edges of a tube or container, and more particularly to adevice for applymg a waterproof adhesive to the parts to be sealed.

Various means have been provided hereto fore for applying pastes andwater soluble adhesives to the portions of a sheet of paper to besealed, but the adhesive applylng devices proposed heretofore are notsuitable for applying a water-proof adhesive of the type that solidifiesas it becomes cool and therefore must be applied in a hot condition.

If an adhesive of the type that remains soft and viscous only while in ahot condltion is employed to secure the portions ofa paper tubeor'container together, it is found diflicult to produce strong scams oroints, due to the fact that the hot adhesive when applied to the paperin a thin layer cools so quickly that it becomes more or less stiff andnon-viscous before a second plece of paper can be forced into engagementtherewith.

One important feature ofthe present invention therefore resides in meansfor applying hot waterproof adhesive to a sheet of paper in a thinlayer, and in means for quickly forcing a second piece of paper mtointimate engagement with the adhesive layer before it has had a chanceto cool. This causes the waterproof adhesive to firmly, secure thepieces of paper together.

vThe means of the present invention for applyin water-proof adhesive toform strong urable seams or joints may be em loyed for various purposes,but it 1spart1cuarly well adapted for use-in the manufacture ofwater-proof bags or containers made of water-proof paper. Because if the'oint s or seams of these containers are strong ysecured together by awater-proof adhesive they will not be affected by moisture, whereas if awater soluble adhesiveis employed in making such joints, as heretofore,the seams will give way when exposed to moisture.

. A more specific feature of the invention resides in means fordepositing a narrow stream of hot adhesive upon a piece of paper, and ina heated spreader for readmg the adhesive out upon the paper mto a meansis so constructed that it pulls the folded sheet forward withoutpressing on the sheet at the line of fold.

Other features of the invention and novel combination of parts inaddition to the above will be hereinafter described in connection withthe accompanying drawings which illustrate one good, practical form ofthe invention.

In the drawings,- I

Fig. 1 is a perspective view of a machine provided with means foradvancing a sheet of paper and for folding the opposite sides of thesheet into overla ping relation, and is provided with means ordepositing adheslilve between the overlapping portions of the s eet. I

Fig. 2 is a longitudinal sectional View thru the machine of Fig. 1.

Fig. 3 is a perspective view? showing the overlapping portions of-thesheet of paper with the adhesive applying means projectlng between theoverlapping portions.

Fig. 4 on an enlarged scale is avertical sectional view thru theadhesive supply pipe.

Fig. 5 is a perspective view of a portion of a tube showin theoverlapping portions adhesively secure together and showin the In theembodiment of the invention shown, the sheet of paper to which the ad-16 of the folders. The guide or folder 12 serves to fold the sideportion 17 of the sheet of a er over the opposite side portion 18, antit e sheet of paper thus folded may be advanced over the face of thetable 10 by an suitable means.

he means shown for advancing the paper lengthwise of the table consistsof the feed rolls 19, 20 and 21, mounted upon and rigidly secured to thedriving shaft 22. The ends of this shaft are journaled in the bearin s23 and 24 supported at the opposite si es of the table 10, and the shaft22 may be driven by the pulley 25. These feed rolls are supported abovethe sheet of paper, and below the sheet of paper are yieldingly mountedthe cooperating rolls .26, 27 and 28.

Various means might be provided for urging these yielding rolls towardsthe cooperatlng rolls 19, 20 and 21 so that they will frictionallyengage the sheet of paper, and

in the construction shown the yielding rolls .26, 27 and 28 aresupported by the levers 29,

Y levers, and the lower ends of these springs rest upon the transverselyextending bar 36. Each-of the levers 'ust mentioned consists of a pairof spaced ars between which the respective rollers are mounted and theserollers'are rotatably secured to the levers by the short shafts 37. Thearrangement is such that the upward pressure of the springs upon theouter ends of the levers forces the rollers 26, 27 and 28 upwardly intofrictional engagement with the paper passing between the upper and lowerrolls, to cause the power driven rolls to advance thepaper. 7

It is important that the means provided for advancing the sheet of paper11 over the face of the table shall not press upon the sheet 10 at theline of fold along the opposite sides of the sheet of paper, which lineis indicated. by 38 and 39. If a substantial pressure is exerted uponthe paper at the line of fold it will crease the same and will-materially reduce the strength of the paper where it is folded. Thedistance between the upper feed rolls 19 and 21, in the constructionshown, is therefore less than the width of the sheet of paper advancedby these rolls, and the same is true of" the lower feed rolls 26 and 28.As a result the cooperating rolls serve to advance the sheet of paperwithout pressing u on the sheet at the lines of fold, indicated y 38 and39.

As stated an important feature of the? ably somewhat cone-shaped, asshown at 41. This receptacle ma be supported in spaced relation to theta 1e 10 by any suitable means such as the downwardly extending bolts 42the lower ends of which are adjustably connected by nuts 43 to lugs 44projecting laterally from the opposite sides of the receptacle 40.

When the water proof adhesive is used to unite the overlapping sideportions of a sheet of paper, as in the present case, it is desirable toprovide the adhesive receptacle 40 with a laterally extending pipe orother means which is adapted to extend inwardly between the overlappingportions 17 and 18 of the sheet of paper. The receptacle 40 is thereforeshown as having a curved pipe or elbow 45 leading from the lower portionof the receptacle, and this elbow is provided with a' threaded outer end46 adapted to receive the horizontally extending pipe 47 the outer endof which extends between the overlapping portions of the sheet of paper.

The end of the pipe 47 may be closed with a plug 48 and this pipe isprovided near its outer end with a small hole or port 49 thru which theadhesive may issue in the form of a stream 50, as best shown in Figure4. It is'desirable to provide valve means for controlling the dischargeof adhesive thru the port 49 and to this end, in the construction shown,a tube 51 is rotatablycmounted within the pipe 47 and this tube isprovided with a port 52 which may be rotated either into or out ofalignment with the port 49. The inner tube 51 may be operated by ahandle 53, the inner end of which may be screwed into a wall of thetube, and this lever extends thru a slot formed in the outer pipe 47,and which slot limits the angle thru which the inner tube 51 may berotated.

It is important to provide means for keepingthe adhesive within thereceptacle 40 and pipe 47 at a relatively high tempera: ture, and tothis end, in the construction shown, an electric heating coil 54 ispro-- vided within the receptacle 40 and the lower end ortion of thiscoil preferably extends iengt wise within the pipe 47, as indicated 55.If desired, the conductor wires 56 of the heatin coilmay be mountedwithin a tube 57 which protects the wires from the adhesive. It isdesirable to prevent the loss of heat from the receptacle 40 and thelaterally extending pipe 47; the pipe 47 is therefore shown as providedwith an insulating casing or covering 58, and the receptacle 40, may belikewise provided with an lnsulatmg CS1I1g.,

As a result of the construction just described, it will be seen that asthe folded sheet of paper 11 is fed lengthwise of the table the hotwater-proof adhesive such as asphaltum will be deposited upon the por-'tion 18 of the sheet of paper in the form of a narrow stream 50. Inorder to insure I the formation of a tight joint between the overlappingportions of the sheet of paper it'is necessary to convert the narrowstream 50 of adhesive into a thin layer or strip, as indicated by 59,and to this end, in the construction shown, the pipe 47 is provided atits under face with a spreader 60 whichmay constitute an enlar edportion formed upon the pipe, and t e length of the spreader 60 mayserve to accurately determine the width of the adhesive stri 59, since,if the amount of hot adhesive elivered to the paper is properlyregulated by adjusting the valve above mentloned, the spreader 60 willflatten the adhesive out into a thin ribbon or strip having a widthcorresponding to the length of the spreader.

It is important to note that slnce the pipe 47 is maintained at arelatively high tempei'atureby the electric coil 55 therein the spreader60 will likewise be maintained at a relatively high temperature with theresult that it will serve to flatten the stream of adhesive out into theform of a ribbon or stri without permitting the same to coolappreciably. The upper overlapping portion 17 of the sheet of paper maythen be uickly forced into firm engagement with i t e hot adhesive strip59 by the cooperating rolls 20 and 27 to effect an intimate engagementof the strip of adhesive with both portions of the sheet of paper beforethe adhesive has had an opportunity to cool appreciably. This isaccomplished, in the present invention, by advancing the sheet of paper11 over the table at a relatively high speed and by constructing theadhesive supply pipe 47 so that it willextend inwardl between theoverlapping portions of the s eet while at the'same time it spreads theoverlapping portions to only a slight de ree. As a result,

of this construction the ad esive depositing pipe 47 may be positionedrelatively close to the cooperating rolls 20 and 27 which force theoverlap ing sheets into intimate engagement with t e adhesive.

From the foregoin description and drawings it will be seen t 1at theadhesive applying means described serves to deposit a hot strip orribbon of a waterproof adhesive between the overlapping portions of atraveling sheet of pa er so that the overlapping portions of the siieetmay be forced into intimate engagement with the adhesive before the samehas cooled sufiiciently to reduce its sticky or viscous condition, andas a result a strong joint or seam is formed which is not affected bymoisture.

Altho the adhesive ap lying means of the present invention may be usedin various elds for applying a ribbon or strip of water-proof adhesiveto a sheet of paper or I 11 fed to the machine will be a waterqirooflg's.

paper, and the resulting tube shown in 5 and 6 with the overlappingedges strongly secured together may be severed transversely at intervalsto produce short tubes which may be formed into water-proof bags orcontainers by closing one end thereof.

What is claimed is 2-- 1. A device for applying a sealing strip of hotasphaltum to one of the overlapping portions of a sheet of paper tounite the portions while the adhesive is hot, comprising in combination,an adhesive-containing receptacle provided with a pipe-like projectionconstructed to extend between the overlapping portions of the sheet ofpaper and provided with an aperture for discharging a narrow stream ofadhesive upon the lower of the overlapping portions, a ,narrow spreaderprovided upon said rojection and having a width correspon ing to andadapted to accurately determine the width of the adhesive strip appliedto the paper and positioned to spread the adhesive out upon the paperwith a smooth ironing action, and means for heating the pipe-likeprojection and spreader t0 lnsure application of the asphaltum to thepaper in a hot condition and to spread the adhesive out with a hotironin action that prevents the adhesive from being chilled by itscontact with the paper.

2. A device for a pl in a sealin stri of adhesive in a hotgcoiidi t ionbetwein th ei overlapping portions of a sheet of pa er to unite theportions while the adhesive 1s hot, comprising in combination, anadhesive containing receptacle provided with a pipelike projectionconstructed to extend between the overlapping portions of the sheet ofpaper and having an aperturefor discharging a narrow stream of adhesiveupon one of said portions, a narrow spreader upon said projection andadapted to spread the adhesive out upon the paper with a smooth ironingaction into a strip having a width that is accurately determined-by thewidth of '5 the spreader, and means for heating the pipe-like projectionand spreader to insure application of the adhesive to the paper ina'h'ot condition and to spread the'adhesive out with a hot ironingaction that prevents the adhesive from being chilled by its con- 10 tactwith the paper.

In testimony whereof, I have signed my name to this s ecification.

' HARLES H. HOWARD.

